Explain throwing away return values

Akuli · web-flow · commit 6dbe37d2d0b5 · 2016-08-01T22:35:35.000+03:00
diff --git a/3.md b/3.md
@@ -59,6 +59,14 @@ So doing `x = print('hello')` set `x` to `None`. Here's what happened, explained
 
 All functions need to return something. So does the print function, and that's why it returns `None`. Of course, `x = print('hello')` is useless compared to `print('hello')`, because the print function always returns `None` and we can do `x = None` without any printing.
 
+Calling a function without assigning the return value to anything (e.g. `print('hello')`) simply throws away the return value. The interactive `>>>` prompt also echoes the return value back if it's not None:
+
+```py
+>>> str(123)
+'123'
+>>> 
+```
+
 If you still have trouble understanding functions, feel free to come to a good Python IRC channel like [#python](https://kiwiirc.com/client/irc.freenode.net/#python), [##python-friendly](https://kiwiirc.com/client/irc.freenode.net/##python-friendly) or [##learnpython](https://kiwiirc.com/client/irc.freenode.net/##learnpython). There will be plenty of skilled people ready to help you. Just ask your question nicely and be patient.
 
 You can also pass multiple parameters separated with commas. The print function will add spaces between them.
